19048.The age of pyramid with broad base indicates
High percentage of old individuals
Low percentage of young individuals
High percentage of young individuals
Low percentage of old individuals
19050.
Assertion: In a food chain members of successive higher levels are fewer in number.
Reason: Number of organisms at any trophic level depends upon the availability of organisms which serve as food at the lower level.
The correct answer is:Both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
Both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.
Assertion is true statement but Reason is false.
Both Assertion and Reason are false statements.
19051.
Assertion: Tropical rain forests are disappearing fast from developing countries such as India.
Reason: No value is attached to these forests because these are poor in biodiversity.
The correct answer is:Both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
Both Assertion and Reason are true but the Reason is not the correct explanations of Assertion.
Assertion is true, but Reason is false.
Both Assertion and Reason are false.
19052.Which of the following is an example of man-made ecosystem?
Tissue culture
Aquarium
Herbarium
Forest
19054.The food chain, in which the microorganisms breakdown the energy-rich organic compounds prepared by the producers, is known as
Detritus food chain
Predator food chain
Parasitic food chain
Ecosystem
19055.Biotic factors refer to
Gases produced by industries
Nutrient-deficient soils
Living organisms
Fossil fuel
19056.Microbes that break down the complex organic matter into simple substances like carbon, nitrogen, water etc. are
Producers
Decomposers
Consumers
Symbionts
19057.The 10% law for energy transfer in food chains was given by
Stanley
Tranley
Lindemann
Weismann
19058.Which one of the following statements is correct for secondary succession?
It is similar to primary succession except that it has a relatively fast pace
It begins on a bare rock
It occurs on a deforested site
It follows primary succession
19059.In an ecosystem, the main source of energy is
heat released during transpiration
solar energy
sugar stored in plants
heat released during fermentation
19060.Of the total incident solar radiation the proportion of PAR is
More than 80%
About 70%
About 60%
Less than 50%
19061.Stratification is more common in
Deciduous forest
Tropical rain forest
Temperate forest
Tropical savannah
19062.Quercus species are the dominant component in
Tropical rain forests
Temperate deciduous forests
Alpine forests
Scrub forests
19063.In a comparative study of grassland ecosystem and pond ecosystem, it may be observed that
primary and secondary consumers are similar
the abiotic components are almost similar
the biotic components are almost similar
both biotic and abiotic components are different
19065.Mass of living matter at a trophic level in an area at any time is called
Standing state
Standing crop
Detritus
Humus
19066.Which of the following ecosystems has highest rate of gross primary production?
Grasslands
Mangroves
Coral reefs
Equatorial rain forests